Discussion
Assertion (A): Mole fraction is smaller than mass fraction for a heavy solute in a light solvent.
Reason (R): The heavy species contributes fewer moles per unit mass than the light one does.
Answer: B
Both are true and the reason gives the cause: dividing by a larger molar mass yields fewer moles, so the species counts for less on a mole basis than it does by weight. The effect is largest when the molar masses differ widely.
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